Malicious PDF — malware analysis report

Static analysis result for SHA-256 71df8e513911d8fa…

MALICIOUS

PDF

71.1 KB Created: 2021-03-16 10:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 535c2db0ec69274a91f0c40a965da1d7 SHA-1: 91706c9f637854f6ec4076f21fa20bbc2d2cc84b SHA-256: 71df8e513911d8fa3c8fde6ac7175286fca60716595c4222ead987e5f53cc909
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wix?keyword=the+like+switch+pdf+espa%25C3%25B1ol PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379982/normal_5ff0de55f09ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_601441f5b777e.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/fijjcjA/mekud.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/AfQhguq/shreya_ghoshal_tamil_hit_songs_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/HiclK87/hot_wheels_track_builder_unlimited_triple_loop_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/jbSYxje/54405211583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_60277bb8689cb.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/hd5hhNM/9717147621.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/56570403243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezebepit/voodoops2controller._kext_sierra.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/52311012721.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/wow_lunker_fishing_guide.pdfIn PDF document text
    • http://puxisozebipisal.rf.gd/buxagobubi.pdfIn PDF document text
    • http://wakurenup.epizy.com/dawinukenubenu.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_8f0420e063bc4d8791c69132a6331b29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitirew/diranuwajepadujodidosuwup.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/sigugafu.pdfIn PDF document text
    • http://tefopikov.rf.gd/mapeduduxinidarer.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/34135055975.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/orange_piano_sheet.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_868e4eccafe84c26a918fff02d825f2c.pdf?index=trueIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_5d4a61721dc24152916a3cbca4bf8c8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/mxr_carbon_copy_analog_delay_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 5464 bytes
SHA-256: 169a0dfc35e946674e20d13e4cf7f67af5b26a39db5da236f3647c54de3127e2
font_01_sfnt_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 13680 bytes
SHA-256: bada9aef8155c4f320e8edf735a04b5d8fcc55a5e8484f805e4114a424bb9ef0

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